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An ink cartridge includes an ink chamber; a communication chamber that is
capable of communicating with the ink chamber; a valve that is movable; a
support disposed within the communication chamber, the support including
a valve seat and an opening exposing a bottom of the valve at an
approximately central portion, wherein the valve seat is adjacent to the
valve at an outer periphery of the opening; and an urging device that
extends from the valve seat, the urging device directly contacting the
valve and urging the valve toward the valve seat, wherein the valve
separates from the valve seat when a predetermined force is applied to
the valve and the support and the urging device are formed as a one-piece
member.

1. An ink cartridge, comprising: a first surface; a second surface
opposite the first surface; an ink chamber configured to store an ink and
at least a portion of the ink chamber is positioned between the first
surface and the second surface; a gripping part extending away from the
second surface in a first direction, wherein a width of the gripping part
is less than a width of the ink chamber in a second direction which is
substantially perpendicular to the first direction; a first communication
chamber extending from the ink chamber toward the first surface; a first
valve device disposed within the first communication chamber and
configured to selectively allow and prohibit a fluid communication
between the ink chamber and an exterior of the ink cartridge; a second
communication chamber extending from the ink chamber toward the first
surface; a second valve device disposed within the second communication
chamber and configured to selectively allow and prohibit the fluid
communication between the ink chamber and the exterior of the ink
cartridge.

2. The ink cartridge of claim 1, wherein the gripping part has an inner
space formed therein, and the inner space is in a fluid communication
with the ink chamber.

3. The ink cartridge of claim 2, wherein the gripping part is configured
to indicate a color of ink stored in the ink chamber.

4. The ink cartridge of claim 3, wherein a mesh of grooves are formed in
an inner wall surface of the gripping part.

5. The ink cartridge of claim 4, wherein the mesh of grooves are
configured to hold an ink therein.

6. The ink cartridge of claim 5, wherein the gripping part is translucent
and the gripping part is configured to indicate the color of ink stored
in the ink chamber with an aid of the ink held in the mesh of grooves.

7. The ink cartridge of claim 2, wherein a mesh of grooves are formed in
an inner wall surface of the gripping part.

8. The ink cartridge of claim 7, wherein the mesh of grooves are
configured to hold an ink therein.

9. The ink cartridge of claim 1, wherein the ink cartridge has a space
formed therein, wherein the space opens at the first surface, extends
from the first surface toward the ink chamber, and is not in a fluid
communication with the ink chamber.

10. The ink cartridge of claim 1, wherein each of the first valve device
and the second valve device comprises: a valve that is movable; and a
one-piece support that includes: a valve seat with an opening exposing a
bottom of the valve at an approximately central portion, wherein the
valve seat is adjacent to the valve at an outer periphery of the opening,
and an urging device that extends from the valve seat, the urging device
directly contacting the valve and urging the valve toward the valve seat,
wherein the valve separates from the valve seat when a predetermined
force is applied to the valve.

11. The ink cartridge of claim 10, wherein one of the first valve device
and the second valve device further comprises an operation member
extending from the valve through the opening of the valve seat.

12. The ink cartridge of claim 1, wherein the first communication chamber
is configured to selectively supply ink from the ink chamber to the
exterior of the ink cartridge, and the second communication chamber is
configured to selectively introduce air from the exterior of the ink
cartridge into the ink chamber.

13. An ink cartridge, comprising: a first surface; a second surface
opposite the first surface; an ink chamber configured to store an ink and
at least a portion of the ink chamber is positioned between the first
surface and the second surface; a gripping part extending away from the
second surface in a first direction, wherein a width of the gripping part
is less than a width of the ink chamber in a second direction which is
substantially perpendicular to the first direction; a first communication
chamber extending from the ink chamber toward the first surface; a first
valve device disposed within the first communication chamber and
configured to selectively allow the first communication chamber to supply
ink from the ink chamber to an exterior of the ink cartridge, and
prohibit the first communication chamber from supplying ink from the ink
chamber to the exterior of the ink cartridge; a second communication
chamber extending from the ink chamber toward the first surface; a second
valve device disposed within the second communication chamber and
configured to selectively allow the second communication chamber to
introduce air from the exterior of the ink cartridge into the ink
chamber, and prohibit the second communication chamber from introducing
air from the exterior of the ink cartridge into the ink chamber.

14. An ink cartridge, comprising: a first surface; a second surface
opposite the first surface; an ink chamber configured to store an ink and
at least a portion of the ink chamber is positioned between the first
surface and the second surface; a gripping part extending away from the
second surface in a first direction, wherein a width of the gripping part
is less than a width of the ink chamber in a second direction which is
substantially perpendicular to the first direction; a first communication
chamber extending from the ink chamber toward the first surface; a first
valve device disposed within the first communication chamber; a second
communication chamber extending from the ink chamber toward the first
surface; a second valve device disposed within the second communication
chamber, wherein each of the first valve device and the second valve
device comprises: a valve that is movable; a valve seat; and an urging
device configured to urge the valve toward the valve seat, wherein the
valve separates from the valve seat when a predetermined force is applied
to the valve.

[0003] This invention relates to an ink cartridge and an inkjet recording
apparatus equipped with the ink cartridge.

[0004] 2. Description of Related Art

[0005] An ink cartridge is typically loaded into an inkjet recording
apparatus by mounting the ink cartridge into the inkjet recording
apparatus. A rubber stopper is attached to the ink cartridge and prevents
air, ink or any other material from entering or exiting the ink
cartridge. The inkjet recording apparatus includes a hollow needle with
an acuminate tip. When the ink cartridge is pushed and loaded into the
inkjet recording apparatus, the hollow needle penetrates the stopper plug
so that an inside of the ink cartridge is in communication with the
hollow needle in order to supply ink to the inkjet recording apparatus.
However, the acuminate tip of the hollow needle is formed with the
acuminate tip projecting toward the user. It is thus necessary to employ
safety measures in order to prevent a user from touching the tip.

[0006] In Japanese Unexamined Patent Application Publication H3-197052,
for example, an inkjet recording apparatus is equipped with a protection
device that protects the user from the hollow needle when the hollow
needle is exposed. The protection device has a protection plate installed
between the hollow needle and a side in which the ink cartridge is
inserted in order to cover the hollow needle. When the ink cartridge is
loaded, a lock of the protection plate when the protection plate is in a
shielding position is released and the hollow needle is exposed.
Furthermore, the hollow needle penetrates the stopper plug and the ink
cartridge is thus loaded in the inkjet recording apparatus. Furthermore,
when the ink cartridge is removed, the protection plate is placed in the
shielding position by a twisted coil spring and held at that position by
a lock component. Thus, the protection plate shields the user from
touching the hollow needle.

[0007] As disclosed in Japanese Unexamined Patent Application No.
2001-113723, there also exist ink cartridges that prevent ink from
leaking from the cartridges when the cartridges are removed from inkjet
recording devices. Such ink cartridges are provided with an ink chamber
that stores ink, an ink supply port that externally supplies ink stored
in the ink chamber, and an ink guidance chamber formed between the ink
chamber and the ink supply port.

[0008] The ink guidance chamber houses a valve unit, and a cylindrical
packing is inserted into the ink supply port. The valve unit is urged by
a compression spring in a direction elastically contacting the
cylindrical packing in order to obstruct the ink flow path, and the valve
unit prevents ink from leaking from the ink chamber side. The ink
cartridge is structured such that, when attached to an inkjet recording
device, an ink supply needle penetrates the cylindrical packing and
opposes the urging force of the compression spring to press the valve
unit toward the ink chamber. An ink flow path is thereby formed in order
to supply ink.

[0009] There also exist ink cartridges, for example, in Japanese Laid-Open
Patent Application No. 9-20018, in which the color of ink stored in the
ink cartridge is easily recognized. Such ink cartridges include container
bodies including porous materials into which ink is absorbed, and cover
members that cover top openings of the containers. The cover members are
formed of materials that are the same color as the ink absorbed by the
porous materials. Therefore, even when ink cartridges of multiple colors
are installed, because installation can be performed by recognizing the
color of cover members of those ink cartridges, misinstallation of ink
cartridges of different colors can be prevented. In addition, in order to
recognize the color of the ink in the ink cartridge, ink cartridges
formed from transparent or semi-transparent materials are also known.

[0010] There also exist ink cartridges, for example, in Japanese Laid-Open
Patent Application 11-58775, to which a deaerating processing has been
performed in order to store deaerated ink. The ink cartridge is included
within a packaging body and the packaging body is held in a
pressure-reduced state. The packaging body is held in a pressure-reduced
state in order to suppress the deterioration of the deaerated ink while
the ink cartridge is transported.

[0011] The inside of the ink cartridge is also divided into two spaces by
a partition wall. Within the two spaces divided by the partition wall,
one space is used as an ink supply chamber that temporarily stores ink
that is supplied from an ink supply hole, and another space is used as an
ink chamber that is filled by a porous member that can store ink. In
order to store a large amount of ink, the ink chamber requires more space
than the ink supply chamber. Because of this, the partition wall is
arranged at a position that is significantly closer to an opposite end
wall of the ink supply chamber.

SUMMARY OF THE INVENTION

[0012] In the ink cartridge in Japanese Unexamined Patent Application No.
2001-113723, for example, where the leakage of ink is prevented as
described above, there is provided a switching valve unit which opens and
obstructs the ink flow path and a compression spring which urges the
valve unit. Thus, an ink guidance chamber is required in order to attach
the valve unit. Furthermore, the compression spring must be formed
between the ink supply port and the ink chamber. The structure for
forming an ink flow path thus becomes complex. Because the valve unit and
the compression spring are attached within the ink guidance chamber, the
attachment operation becomes difficult, requiring further manufacturing
steps. Consequently, high manufacturing costs are required to produce the
ink cartridge.

[0013] Additionally, a compression spring made from metal is used. When
recycling, a metal compression spring cannot be discarded together with
the ink cartridge which is constructed from resin materials. Thus, when
disposing of an ink cartridge, it is first necessary to disassemble the
ink cartridge and remove the compression spring. As a result, the use of
a metal compression spring entails problems in that the complexity of
discarding an ink cartridge is increased, and disposal costs also become
high.

[0014] The present invention allows, among other things, a reduction in
manufacturing costs and a reduction in disposal costs.

[0015] In exemplary embodiments, an ink cartridge includes an ink chamber;
a communication chamber that is capable of communicating with the ink
chamber; a valve that is movable; a support disposed within the
communication chamber, the support including a valve seat and an opening
exposing a bottom of the valve at an approximately central portion,
wherein the valve seat is adjacent to the valve at an outer periphery of
the opening; and an urging device that extends from the valve seat, the
urging device directly contacting the valve and urging the valve toward
the valve seat, wherein the valve separates from the valve seat when a
predetermined force is applied to the valve and the support and the
urging device are formed as a one-piece member.

[0016] In exemplary embodiments, a valve device includes a valve that is
movable; and a one-piece support. The one-piece support includes a valve
seat with an opening exposing a bottom of the valve at an approximately
central portion, wherein the valve seat is adjacent to the valve at an
outer periphery of the opening, and an urging device that extends from
the valve seat, the urging device directly contacting the valve and
urging the valve toward the valve seat, wherein the valve separates from
the valve seat when a predetermined force is applied to the valve.

[0017] In exemplary embodiments, an ink cartridge includes an ink chamber
that can store ink; a communication chamber with a first opening that
communicates with the ink chamber and a second opening that can receive
an extract component; a valve that is positioned between the first
opening and the second opening; and a support that supports a bottom
surface of the valve and urges a top surface of the valve toward the
second opening.

[0018] In exemplary embodiments, a method of supplying ink from an ink
cartridge with a valve that is movable, a support that includes a valve
seat and an opening exposing a bottom of the valve at an approximately
central portion with the valve seat adjacent the valve at an outer
periphery of the opening, and an urging device that extends from the
valve seat with the urging device directly contacting the valve and
urging the valve toward the valve seat, wherein the support and the
urging device are formed as a one-piece member, includes moving an
extract component into contact with the bottom of the valve; and applying
a predetermined force to the valve such that the valve moves away from
the valve seat and a top of the urging member flexes outwardly relative
to a bottom of the urging member.

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Various exemplary embodiments of the invention will be described in
detail with reference to the following figures, wherein:

[0020] FIG. 1 is a schematic diagram of an exemplary ink cartridge
according to the present invention and an exemplary inkjet recording
apparatus according to the present invention on which the ink cartridge
is mounted;

[0021] FIG. 2 is a sectional diagram showing the structure of an exemplary
ink cartridge according to the present invention before the ink cartridge
is loaded into an inkjet recording apparatus;

[0022] FIG. 3 is an oblique perspective view of an exemplary valve member
according to the present invention;

[0023] FIG. 4 is an oblique perspective view of a tip part of an exemplary
ink extract tube according to the present invention;

[0024] FIG. 5A is a sectional view of an exemplary ink extract tube
according to the present invention before the ink extract tube enters
into a guide path and contacts an exemplary valve member according to the
present invention;

[0025] FIG. 5B is a cross-section view of an exemplary ink extract tube
according to the present invention contacting an exemplary valve member
according to the present invention and pushing the valve member toward an
ink chamber;

[0026] FIGS. 6A, 6B and 6C are side views depicting rupture of a film
member by an exemplary valve member according to the present invention,
and FIGS. 6D, 6E and 6F are top views corresponding to FIGS. 6A, 6B and
6C, respectively;

[0027] FIG. 7 is a sectional diagram showing the structure of an exemplary
ink cartridge according to the present invention before the ink cartridge
is loaded into an inkjet recording apparatus;

[0028] FIGS. 8A-8E depict an exemplary valve member according to the
present invention: FIG. 8A is a plan view, FIG. 8B is a side view, FIG.
8C is a sectional view taken along a line I-I line of FIG. 8A, FIG. 8D is
a sectional view taken along a line II-II of FIG. 8A and FIG. 8E is a
bottom view;

[0029] FIGS. 9A and 9B depict an exemplary valve member according to the
present invention: FIG. 9A is a plan view and FIG. 9B is a side view;

[0030] FIG. 10 is a sectional view of a holding member of an exemplary
valve member according to the present invention;

[0031] FIGS. 11A and 11B are sectional views of an exemplary ink cartridge
according to the present invention: FIG. 11A depicts a state prior to
installation and FIG. 11B depicts a state after installation;

[0032] FIGS. 12A-12C depict the valve member of FIGS. 11A and 11B: FIG.
12A is a plan view, FIG. 12B is a sectional view and FIG. 12C is a bottom
view;

[0033] FIG. 13 is a sectional diagram showing the structure of an
exemplary ink cartridge according to the present invention before the ink
cartridge is loaded into an inkjet recording apparatus;

[0034] FIG. 14A is a perspective view of an exemplary ink cartridge
according to the present invention from an upper direction;

[0035] FIG. 14B is a perspective view of an exemplary ink cartridge
according to the present invention from a lower direction;

[0036] FIG. 15 is a sectional view taken along a line III-III of FIG. 14B;

[0037] FIG. 16 is a sectional view of the ink chamber of FIG. 15 during a
state when the ink cartridge is packaged;

[0038] FIG. 17 is a sectional view taken along a line IV-IV of FIG. 15;

[0039] FIG. 18 is a sectional diagram of an exemplary ink cartridge
according to the present invention;

[0040] FIG. 19A is an enlarged diagram showing an inner wall surface of an
exemplary ink cartridge according to the present invention;

[0041] FIG. 19B is an enlarged cross-sectional diagram showing part D in
FIG. 18; and

[0042] FIGS. 20A-20D are diagrams showing various exemplary dispersing
grooves according to the present invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0043] FIG. 1 is a schematic view showing an ink cartridge 1 according to
an embodiment of this invention and an inkjet recording apparatus 2 to
which the ink cartridge 1 mounts.

[0044] The ink cartridge 1 is formed so as to be detachable with respect
to the inkjet recording apparatus 2 that is provided with a recording
head 7 which ejects ink I. The ink cartridge 1 stores the ink I to be
supplied to the recording head 7. One of a plurality of ink colors, such
as cyan, magenta, yellow, black, or the like, is filled in the ink
cartridge 1 as ink I, and a plurality of ink cartridges 1 that are filled
with different ink colors are mounted to the inkjet recording apparatus
2. Color printing is thus made possible.

[0045] The inkjet recording apparatus 2 is provided with a mounting part 3
which detachably mounts the ink cartridge 1, a tank 5 which stores the
ink I supplied from the ink cartridge 1 via an ink supply tube 4, the
recording head 7 which emits the ink I stored in the tank 5 to recording
paper 6, a carriage 8 in which the tank 5 and the recording head 7 are
mounted and which is movable in two linear directions, a carriage shaft 9
which is a guide by which the carriage 8 moves in the two linear
directions, a transport mechanism 10 which transports the recording paper
6, and a purge device 11.

[0046] The mounting part 3 is composed of a base part 3a that is
sandwiched by a guide part 3b which is set on both sides of the base part
3a. A hollow ink extracting tube 12 extracts the ink I stored in the ink
cartridge 1 and a hollow outside air intake tube 13 introduces outside
air to the ink cartridge 1. The ink extracting tube 12 and the air intake
tube 13 are examples of extract components.

[0047] The ink supply tube 4 is connected with one end side of the ink
extracting tube 12, and the ink extracting tube 12 is connected to the
tank 5 via the ink supply tube 4. The outside air intake tube 15 is
connected to one end side of the air intake tube 13, and the outside air
intake tube 13 is connected to outside air via the outside air intake
tube 15.

[0048] The ink cartridge 1 is mounted from a direction (arrow X direction)
perpendicular to the mounting part 3. At this time, the ink extracting
tube 12 and the air intake tube 13 contact a valve member 32 (see FIG. 2)
of the respective valve devices 18, 19 which is provided inside of the
ink cartridge 1, push the respective valve members 32 up toward an ink
chamber 16, and communicate with the inside of ink chamber 16.

[0049] A plurality of nozzle holes are provided in the recording head 7 on
a surface to be opposite the recording paper 6. By driving an actuator
composed of piezoelectric elements, the ink I stored in the tank 5 is
emitted from the nozzle holes to the recording paper 6. Furthermore, if a
recording operation is actually performed, recording is performed onto
the recording paper 6 as the carriage 8, which mounts the recording head
7, moves back and forth.

[0050] Furthermore, the recording head 7 is arranged above the mounting
part 3. A negative pressure (back pressure) is thus given to the ink I
within the nozzle holes due to the pressure head difference between the
ink cartridge 1 mounted in the mounting part 3 and the nozzle holes.

[0051] A purge device 11 is outside the recording area and arranged so as
to face the recording head 7. The purge device 11 is provided with a
purge cap 11a which covers a nozzle hole formation surface of the
recording head 7, a waste ink tube 11b which communicates with the purge
cap 11a, and a pump 11c which intakes ink from the nozzle holes via the
waste ink tube 11b.

[0052] When the purge processing is performed, the carriage 8 is moved to
a purge processing executing position, and the nozzle hole formation
surface of the recording head 7 is covered by the purge cap 11a. In this
state, by driving the pump 11c, poor ink that includes bubbles, dust or
the like remaining inside the recording head 7 is vacuumed. The poor ink
is then stored in an undepicted waste ink tank via the waste ink tube
11b. The recording operation and the purge process are controlled under a
central processing unit (CPU) (not shown) mounted on the inkjet recording
apparatus 2.

[0053] The ink cartridge 1 includes a container wall 1a in which the
upper/lower end surfaces are open, and a lid 1b which is fixed in order
to cover and seal the opening on the top surface of the container wall
1a. Furthermore, the container wall 1a and the lid 1b are formed of a
resin material. The ink I to be supplied to the recording head 7 is
stored in the ink chamber 16 formed inside the ink cartridge 1 (see FIG.
2).

[0054] Next, the structure of the ink cartridge 1, in particular part A of
FIG. 1, which is installed in the inkjet recording apparatus 2 is
explained with reference to FIGS. 2 and 3. FIG. 2 is a sectional diagram
showing the structure of the ink cartridge before the ink cartridge is
loaded into the inkjet recording apparatus and FIG. 3 is an oblique
perspective view that illustrates the enlarged valve member.

[0055] As shown in FIG. 2, a partition wall 1c divides the inside of the
ink cartridge 1 into two spaces and is formed integrally with the
container wall 1a. Within these two spaces, the space between the
partition wall 1c and the top opening covered by the lid 1b (i.e., the
top half) is formed as the ink chamber 16 which stores ink, and the space
between the partition wall 1c and the lower opening (i.e., the bottom
half) is formed as a second chamber 17.

[0056] An ink supply port 21 for communicating with the ink chamber 16 and
the second chamber 17 is formed in the partition wall 1c. A thin film
member 31, which can be broken when the ink supply port 21 is closed, is
formed of a resin material integrated with the container wall 1a at the
lower end portion of a cylindrical wall 22 which extends from the
partition wall 1c and surrounds the ink supply port 21. Furthermore, an
air intake opening 26 for communicating with the ink chamber 16 and the
second chamber 17 is formed in the partition wall 1c, and a thin film
member 51 which can be broken when the air intake opening 26 is closed is
formed of a resin material integrated to the container wall 1a at the
lower end portion of a cylindrical wall 24 which depends from the
partition wall 1c and surrounds the air intake opening 26. Thus, when the
ink cartridge 1 is transported, the ink chamber 16 is sealed by the thin
film members 31, 51, and it is possible to prevent the ink within the ink
chamber 16 from leaking to the second chamber 17 via the ink supply port
21 and the air intake opening 26.

[0057] Furthermore, a barrel member 25 is arranged so as to protrude into
the ink chamber 16 from the air intake opening 26. Outside air is
introduced to the upper part of the ink chamber 16 via the air intake
opening 26 and the barrel member 25.

[0058] On the partition wall 1c, a barrel-shaped body 30 as an example of
a communication chamber, which extends toward the opening of the second
chamber 17, is connected and formed so as to protrude into the second
chamber 17 from the partition wall 1c and surround the cylindrical wall
22. In addition, on the partition wall 1c, a second barrel-shaped body 50
as an example of a communication chamber, which extends toward the
opening of the second chamber 17, is connected and formed so as to
protrude into the second chamber 17 from the partition wall 1c and
surround the cylindrical wall 24.

[0059] To make the space between a later-described pointed part 72 and the
film member 51 smaller than the space between the pointed part 72 and the
film member 31, the cylindrical walls 22 and 24 are formed such that the
amount that the cylindrical wall 24 extends from the partition wall 1c is
larger than the amount that the cylindrical wall 22 extends from the
partition wall 1c.

[0060] The valve device 18 is fixed inside the barrel-shaped body 30 and
the valve device 19 is fixed inside the second barrel-shaped body 50. The
valve devices 18, 19 can selectively communicate between the inside and
the outside of the ink chamber 16 and cut off communication between the
inside and the outside of the ink chamber 16.

[0061] Here, the valve device 18 is explained. The valve device 19, which
is fixed to the second barrel-shaped body 50, has the same shape as the
valve device 18. As such, only a detailed explanation of the valve device
18 will be provided.

[0062] The valve device 18 is provided with a support member 46 which is
integrally manufactured by a rubber elastic member and the valve member
32 composed of a resin material. The support member 46 has a
substantially cylindrical shape and is integrally molded and includes a
valve seat part 46a in the intermediate part in the axial direction, an
urging part 46b that is closer to the ink chamber 16 than the valve seat
part 46a, a cylindrical part 35 which extends from the valve seat part
46a toward a side opposite the urging part 46b, and an outer
circumferential wall 33 which extends parallel to, and is spaced from,
the outer circumference of the cylindrical part 35. In other words, the
valve seat part 46a and the urging part 46b are integrally formed as a
one-piece member. The valve member 32 is housed within the urging part
46b, and is urged by the urging part 46b toward the valve seat part 46a.

[0063] The valve device 18 has a positioning part 33a which protrudes from
the outer circumferential wall 33 to an outer circumferential external
direction towards the barrel-shaped body 30. The barrel-shaped body 30 is
formed so that a part of the barrel-shaped body 30 has a smaller external
diameter than that of the positioning part 33a. A step-shape is thus
formed in the barrel-shaped body 30 that contacts the positioning part
33a.

[0064] As shown in the enlarged diagram in FIG. 2 in which the fixed parts
of the valve device 18 and the barrel-shaped body 30 are enlarged, the
barrel-shaped body 30 has a surface 44 with the diameter becoming larger
in tiers outwardly in order to contain the positioning part 33a. A
projection 43 is formed on the surface 44 and is above the positioning
part 33a. A holding wall 42 is also provided and projects inwardly around
the opening of the barrel-shaped body 30 of the container wall 1a. When
the valve device 18 is inserted into the barrel-shaped body 30, the
holding wall 42 holds and presses the positioning part 33a into the
projection 43 while being deformed and bent by heat. The combination of
the holding wall 42 and the projection 43 thus fixes and seals the valve
device 18 relative to the barrel-shaped body 30. By doing so, ink is
prevented from flowing out from the space formed between the external
wall of the valve device 18 and the inner wall of the barrel-shaped body
30.

[0065] The valve seat part 46a has an opening 41 which goes through the
center in the axial direction. When the ink cartridge 1 is mounted to the
inkjet recording apparatus 2, the cylindrical part 35 seals the ink
extracting tube 25 inserted therein. The cylindrical part 35 is provided
with an introducing path 40 in which the ink extracting tube 12, which is
protruding from the inkjet recording apparatus 2, is inserted. The
cylindrical part 35, as an example of an inner peripheral wall, is
integrally connected with the valve seat part 46a in a state in which the
introducing path 40 is connected to the opening 41. The valve member 32
contacting the valve seat part 46a is exposed to the outside through the
opening 41 and the introducing path 40, and faces the ink extracting tube
12 inserted therein. The introducing path 40 is formed smaller than the
outer diameter of the ink extracting tube 12 so as to closely fit to the
inserted ink extracting tube 12. The opening 41 is formed larger than the
outer diameter of the ink extracting tube 12. An end of the introducing
path 40, from which the ink extracting tube 12 is inserted, is formed in
a tapered shape in which the diameter increases towards the outside.

[0066] The cylindrical part 35 and the outer circumferential wall 33, as
an example of an outer peripheral wall, are separated by a predetermined
distance by a ring-shaped groove 34. The cylindrical part 35 is made
elastically deformable in a plane perpendicular to the direction of the
center axis of the introducing path 40 with respect to the outer
circumferential wall 33. As a result, it is easy to expand the
cylindrical part 35 in accordance (in the Y direction in FIG. 5) with the
insertion of the ink extracting tube 12 into the introducing path 40,
such that the fit between the introducing path 40 and the ink extracting
tube 12 is improved. Leakage of the ink is thereby prevented. In
addition, even if the ink extracting tube 12 is inserted diagonally or
offset to the introducing path 40, the ink extracting tube 12 can be
inserted to the introducing path 40 due to the deformation of the
cylindrical part 35. Furthermore, in accordance with the insertion of the
ink extracting tube 12 to the introducing path 40, the inner wall part of
the introducing path 40 is slightly pushed toward the valve member 32 and
thus elastically deforms. However, such deformation is absorbed in the
space in the opening 41 having a large diameter, and thus, the valve
member 32 is not pushed.

[0067] Furthermore, the cylindrical part 35 is formed with a length that
cannot reach the lower edge of the outer circumferential wall 33. In
other words, the edge of the ink extract tube 12 is inserted. Thus, the
remaining ink in the cylindrical part 35 does not soil the surface of a
flat surface when the valve device 18 is placed on that flat surface.

[0068] The urging part 46b is formed by a side wall part 36 which stands
out in a cylindrical shape on the ink chamber 16 side from the outer
circumference of the valve seat part 46a and a projection part 37 which
extends from the side wall part 36 and extends inward so as to contact
the ink chamber 16 side of the valve member 32. The urging part 46b is
also provided with an opening 37a in the center of the projection part
37. The urging part 46b urges the valve member 32 based on the elasticity
of the side wall part 36 and the projection part 37. In a normal state
before the ink cartridge 1 is mounted to the inkjet recording apparatus
2, the valve member 32 contacts the valve seat part 46a. When the ink
cartridge 1 is mounted to the ink jet recording apparatus 2, the ink
extracting tube 12 enters the introducing path 40 and pushes the valve
member 32 up toward the ink chamber 16 so that the side wall part 36 is
extended, the projection part 37 is inclined, and a gap for an ink flow
path is formed between the valve member 32 and the valve seat part 46a.

[0069] The radial thickness t1 (see FIG. 5A) of the side wall part 36
(perpendicular to the axial direction mentioned above) is formed thinner
than the thickness t2 (see FIG. 5A) of the valve seat part 46a in the
intruding direction of the ink extracting tube 12 to the introducing path
40 and the radial thickness of the outer circumferential wall 33. For
this reason, if the valve member 32 is pushed up by the ink extracting
tube 12, the urging part 46b allows for a larger elastic deformation as
compared to the valve seat part 46a and the outer circumferential wall
33, which forms a clearance between the valve member 32 and the valve
seat part 46a.

[0070] The valve member 32 in FIG. 3 is explained next. The valve member
32 is provided with a bottom part 70 which contacts the valve seat part
46a of the support member 46, a valve side wall part 71 which extends in
a cylindrical shape toward the ink chamber 16 from the outer
circumference of the bottom part 70, and a pointed part 72, which
projects toward the ink chamber 16 in the substantially center part of
the bottom part 70, and on which the tip end on the ink chamber 16 side
is formed in a pointed shape (e.g., an acuminate shape). The pointed part
72 projects closer to the ink chamber 16 than the valve side wall part 71
extends.

[0071] The bottom part 70 has a projecting component 39 (see FIG. 2) which
projects toward the valve seat part 46a and is formed circularly on a
surface edge set up against the valve seat part 46a. The projecting
component 39 is also located inside the valve side wall part 71 and
outside the introducing path 40. While the valve member 32 is contained
in the support member 46, the valve side wall part 71 closely contacts
the lower surface of the projection part 37 of the urging part 46b and is
pressed. Due to such pressing, the projecting component 39 deforms the
valve seat part 46a elastically and closely contacts the upper surface of
the valve seat part 46a.

[0072] In the bottom part 70, circumferentially inward with respect to the
valve side wall part 71 and circumferentially outward with respect to the
opening 41, a plurality of communication paths 38 are formed which
communicate with the ink chamber 16 side of the valve member 32 and the
valve seat part of the valve member 32. In this example, eight
communication paths 38 are formed, however, the number is not
specifically limited and any number can be formed.

[0073] The pointed part 72 consists of four plate components 73a-73d which
are positioned in the approximate center of the bottom part 70 and are
combined in the form of an approximate cross. The plate components
73a-73d form grooves 77 extending in parallel and along the axial line
between the plate components 73a-73d located next to each other. Each of
the plate components 73a-73d are, in the direction to the bottom part 70
from the tip 76, equipped with first slope units 74a-74d which slope at a
first angle (for example, approximately "45 degrees" in this example)
against the central axial line extending in the same direction and second
slope units 75a-75d, next to the first slope units 74a-74d, which have a
second angle (for example, approximately "10 degrees" in this example),
which is more acute compared to the first angle, in the direction to the
bottom part 70 from the first slope units 74a-74d.

[0074] The pointed part 72 projects through the opening 37a of the
projection part 37 and is positioned opposite the film member 31 with the
tip 76 spaced at an interval from the film member 31. When the ink
cartridge 1 is mounted to the inkjet recording apparatus 2, as the ink
extracting tube 12 pushes up the bottom part 70 of the valve member 32,
the thin film member 31 breaks, and an ink flow path is formed which goes
through the ink supply port 21, the opening 37a, the communication paths
38, and the ink extracting tube 12.

[0075] When the ink cartridge 1 is detached from the inkjet recording
apparatus 2, the bottom part 70 and the valve seat part 46a are connected
by an urging force of the urging part 46b, and the ink flow path is cut
off.

[0076] Furthermore, when the ink cartridge 1 is mounted to the inkjet
recording apparatus 2, an air intake tube 13, which is arranged by being
protruded from the inkjet recording apparatus 2, is inserted into the
valve device 19. In the same manner as the above-mentioned ink supply, an
outside air flow path is formed which goes through the air intake opening
26, the opening 37a, the communication paths 38, and the air intake tube
13. At approximately the same time, when the ink cartridge 1 is detached
from the inkjet recording apparatus 2, an outside air flow path is cut
off by the urging force of the urging part 46b.

[0077] Next, the ink extract tube 12 and the air intake tube 13 are
explained by referring to FIG. 4. FIG. 4 is an oblique perspective figure
that illustrates the configuration of the neighboring area of the tip
part on the side of the ink extract tube 12. Furthermore, the ink extract
tube 12 and the air intake tube 13 are structured in the same
configuration and dimensions, and therefore, the explanations are made
about the ink extract tube 12 and the explanations about the air intake
tube 13 are omitted.

[0078] The edge of the tip of the ink extract tube 12 on the side of the
valve member 32 is open, and a contact section with the valve member 32
consists of end sections 80a-80d formed on the approximate plane. And the
communicating passages 81a-81d are formed in the shape of grooves cut on
the external wall of the ink extract tube 12. These communicating
passages 81a-81d are formed at approximately even intervals on the
external wall of the ink extract tube 12. Note that in this example, four
communicating passages 81a-81d are formed however, any number can be
formed.

[0079] The ink extract tube 12 has the end sections 80a-80d formed on the
approximate plane, and can press the contact surface of the valve member
32 approximately evenly when it contacts with the valve member 32.
Therefore, tilting of the valve member 32 is avoided and the valve member
32 can constantly maintain the ink passage at a certain level. The
communicating passages 81a-81d are cut and are formed such that even if
the ink extract tube 12 is in contact with the valve member 32, the
passage of the ink through the communicating passages 81a-81d can be
reliably obtained.

[0080] Furthermore, since the tip of the ink extract tube 12 is formed on
the approximate plane, even if the ink extract tube 12 is installed in a
projected state from the installation unit 3, the user will not be hurt
by touching the ink extract tube 12 because the tip is no longer formed
in an acuminate shape as before.

[0081] The valve device 19, positioned in the second barrel-shaped body 50
on the side of the air intake, uses exactly the same components as the
valve device 18 on the side of ink supply mentioned above, fixed in a
similar way. Each part of the air intake tube 12 is in a similar
dimensional relationship to that of the air intake tube 13, and
therefore, detailed explanations are omitted.

[0082] Here, the motion of the valve device 18, when the ink cartridge 1
is loaded into the inkjet recording apparatus 2, is explained by
referring to FIGS. 5A and 5B. When the ink cartridge 1 is loaded into the
mounting part 3, the ink extract tube 12 intrudes into the introducing
path 40 (FIG. 5A), and closely contacts the inside of the introducing
path 40 in a state that blocks the outflow of the ink. When the ink
extract tube 12 and the valve member 32 contact each other and the valve
member 32 is pushed towards the ink chamber 16 (FIG. 5B), the valve
member 32 is separated from the valve seat part 46a by resisting the
elasticity of the urging part 46b. In addition, when the valve member 32
is pushed up, the tip 76 of the pointed part 72 contacts the film member
31 and ruptures the film member 31. As a result, the ink in the ink
chamber 16 is supplied to the barrel-shaped body 30, when the ink enters
into the opening 37a at the top end of the valve device 18, passes
through the communication paths 38 of the valve member 32, between the
lower surface of the valve member 32 and the upper surface of the valve
seat part 46a, into the communicating passages 81a-81d of the ink extract
tube 12 (the ink passage B), and is supplied to the recording head 7. As
for the motion of the pointed part 72 to rupture the film member 31,
further explanations are given below.

[0083] At approximately the same time when the ink extract tube 12
mentioned above intrudes, the air intake tube 13 enters into the valve
device 19 on the side of second barrel-shaped body 50 and pushes up the
valve member 32. Since the space between the film member 51 and the tip
76 of the pointed part 72 is smaller than the space between the film
member 31 and the tip 76 of the pointed part 72, the thin film 51 is
ruptured first as compared to the film member 31 on the side of the ink
extract tube 12. In general, the ink cartridge 1 is packed in a
decompressed state in order to keep the ink in the ink cartridge 1 in a
deaerated state and the ink chamber 16 under a reduced pressure as well.
As mentioned above, by rupturing the film member 51 on the side of the
air intake tube 13 quickly, the film member 31 on the side of the ink
extract tube 12 is ruptured after the air is led to the upper part of the
ink chamber 16 through the barrel member 25. The supply of the ink to the
ink extract tube 12 is thus ensured. If the film member 31 on the side of
the ink extract tube 12 is ruptured too early, the air enters into the
ink passage of the ink extract tube 12 which prevents a smooth supply of
the ink.

[0084] When the ink cartridge 1 is pulled up from the installation unit 3
in order to remove the loaded ink cartridge 1 from the inkjet recording
apparatus 2, the ink extract tube 12 and the air intake tube 13 are
separated from each of the corresponding valve members 32. At the same
time, each valve member 32 returns to a state of closely contacting with
the valve seat part 46a due to the biasing operation of the urging part
46b. At this point, since the circular projecting component 39 is
installed on the surface set up against the valve seat part 46a, the ink
chamber 16 is reliably sealed in order to prevent ink from leaking. In
addition, the ink I remaining near the opening 41 of the valve seat part
46a on the side of the ink extract tube 12 is maintained at that position
forming a meniscus and does not leak outside since the atmospheric
pressure does not apply to the ink on the upper side because the upper
part is blocked by the valve member 32 and the diameter of the
introducing path 40 is small (approximately 2 mm in diameter).

[0085] Next, FIGS. 6A-6F show how the film member 31 is ruptured by the
pointed part 72. The film member 51 is ruptured in the same manner as the
film member 31, and therefore, such explanations are omitted.

[0086] FIG. 6A shows the state where the pointed part 72 is pushed up
together with the valve member 32 towards the ink chamber 16 and the tip
76 closely contacts with the film member 31. In this state, the film
member 31 is not ruptured yet (the state of FIG. 6D).

[0087] FIG. 6B shows the state where the pointed part 72 is pushed up
further and the film member 31 is ruptured by the first slope units
74a-74d. The film member 31 thus only contacts the first slope units
74a-74d of the pointed part 72. Since the film member 31 contacts the
first slope units 74a-74d along the upper surface thereof, the groove 77
is blocked in this state and the passage of the ink is hardly formed (see
FIG. 6E).

[0088] FIG. 6C shows the ink cartridge 1 completely loaded into the inkjet
recording apparatus 2, and the film member 31 is pushed and widened by
the second slope units 75a-75d of the pointed part 72. Because of this,
as shown in FIG. 6F, the groove 77 between each plate component 73a-73d
is released and the ink passage C connecting the ink chamber 16 and the
ink extract tube 12 is formed. The ink passage C is also formed at
approximately even intervals around the circumference of the pointed part
72. It is thus possible to supply the ink to the ink extract tube 12
almost evenly.

[0089] When the film member 31 is pushed and widened by the second slope
units 75a-75d instead of the first slope units 74a-74d, the curving angle
of the ruptured part of the film member 31 changes and the ruptured part
is separated from the groove 77 between the plate components 73a-73d, and
the ink passage is formed as mentioned above. Furthermore, since the
amount of contact between the film member 31 and the plate components
73a-73d becomes lower, when the ink cartridge 1 is removed, the pointed
part 72 and the film member 31 are reliably separated by the biasing of
the urging part 46b.

[0090] As explained above, based on the ink cartridge mentioned above, the
valve member 32 which has a pointed part 72 with the tip formed in an
acuminate shape to rupture the film member 31 is retained by the support
member 46, and such support member 46 is fixed in the barrel-shaped body
30. Because of this, when the ink cartridge 1 is loaded into the inkjet
recording apparatus 2, the valve member 32 is pushed up towards the ink
chamber 16 by the ink extract tube 12. At the same time, the film member
31 is ruptured and the ink passages B and C, which connect the ink
chamber 16 and the ink extract tube 12, are formed. Therefore, it is not
necessary to form the tip of the ink extract tube 12 in an acuminate
shape, which can prevent the user from being hurt by the ink extract tube
12 and thus, can further improve the safety.

[0091] Furthermore, since it is not necessary to form the tip of the ink
extract tube 12 in an acuminate shape, it is also not necessary to newly
position a preventative device that covers the ink extract tube 12. It is
thus possible to prevent the inkjet recording apparatus from becoming
large-scaled and at the same time, since the number of components does
not increase, an increase in production cost can be prevented.

[0092] This invention has been explained based on the examples as
mentioned above. However, this invention is not limited to the examples
explained above and it can be easily assumed that various improvements
and modifications are possible.

[0093] For example, in the above examples, the outside dimensions of the
valve devices 18 and 19 are set a little smaller than the inside
dimensions of the barrel-shaped bodies 30 and 50, and they are fixed by
being pressed by the holding wall 42. However, it is acceptable to make
the outside dimensions of the valve devices 18 and 19 a little bigger
than the inside dimensions of the barrel-shaped bodies 30 and 50 and fix
them by pushing the valve devices 18 and 19 into the barrel-shaped bodies
30, 50.

[0094] And also, in the examples mentioned above, the communicating
passages 81a-81d are formed by cutting the ink extract tube 12 and the
air intake tube 13 including the tip on the side of the ink chamber 16.
However, it is acceptable to form the communicating passages 81a-81d
communicating with the inside and the outside on the side wall of the ink
extract tube 12 and the air intake tube 13.

[0095] Furthermore, in the examples mentioned above, the valve member 32
is formed as a unit with the pointed part 72 with the tip formed in an
acuminate shape, the bottom part 70 and the valve side wall part 71.
However, it is acceptable to form the breaking unit to rupture the film
component and the valve which communicate and block off the ink chamber
16 side and the outer side of the container wall 1a separately.

[0096] FIG. 7 illustrates an ink cartridge according to a second
embodiment of the invention. It is noted that elements similar to or
identical with those in the first embodiment are designated by similar
numerals, and thus the description thereof can be omitted for the sake of
brevity.

[0097] The ink cartridge 1 of the second embodiment includes the ink
chamber 16 with an open top, the container wall 1a, and a cover 1f that
covers the floor area 1e. The ink cartridge 1 also includes two walls 1g
and 1h that form the barrel-shaped bodies 30 and 50 which are open
downward. The valve device 18 is placed in the barrel-shaped body 30 and
the valve device 19 is placed in the barrel-shaped body 50. The valve
device 18 and the valve device 19 are identical and when they are
attached to the inkjet recording device, the ink extracting tube 12 is
inserted into the barrel-shaped body 30 and the air intake tube 13 is
inserted into the barrel-shaped body 50.

[0098] Similar to the first embodiment, the valve device 18 and 19 have
the support member 46 made of rubber-like flexible part material and the
valve member 32 is made of resin. The support member 46 has basically the
same structure as the support member 46 of the first embodiment, but the
outer circumferential wall 33 does not extend as far as the cylindrical
part 35 in the first embodiment. The outer circumferential wall 33 and
positioning part 33a are both formed almost at the same level as the
valve seat part 46a. The positioning part 33a is fixed at the lower end
of cylinder shape walls 1g and 1h, between the surface 44 that is formed
as a part of the barrel-shaped bodies 30 and 50 and cover 1f. With this
arrangement, the valve devices 18 and 19 are fixed on the container wall
1a.

[0099] FIGS. 8A-8E show the details of the valve member 32. The valve
member 32 consists of the bottom part 70 and the valve side wall part 71
which extends vertically from the external circumference of the bottom
part 70. The communication paths 38 are formed in the external
circumference of the bottom part 70 and in the valve side wall part 71
contiguously at a plurality of positions. At one side of each of the
communication paths 38, a protruding part 59 with a substantially
rectangular shape rises at a right angle out of the bottom part 70 with
one side of the protruding part 59 touching the valve side wall part 71.
If the opening part of the communications paths 38 has a round shape, the
round shape prevents smooth ink flow because the round shape tends to
form a meniscus due to the surface tension of the ink. In order to avoid
the formation of meniscus, the opening part may not have a round shape.
Another effective method is to use multiple surfaces for the opening
areas.

[0100] The ridge line of the communication paths 38 as shown in FIG. 8C is
formed in an arc shape and also covers two surfaces that cross at a right
angle with the bottom part 70 and the valve side wall part 71.

[0101] Moreover, the rectangular projection part 59 is formed along one of
the ridge lines of the communication paths 38, rising vertically out of
the opening part of the linked communication paths 38. Therefore the
opening part of the communication paths 38 consists of the surface formed
of the protruding part 59, the surface formed by the bottom part 70, and
the surface formed by the valve side wall part 71. With this structure,
the opening part becomes complex and thus prevents the formation of a
meniscus. Where the bottom part 70 touches the valve seat part 46a, the
projecting component 39 is formed in a ring-shape at an area closer to
the center of the bottom part 70 than the communication paths 38 but
external to the opening 41. When the valve member 32 is closed, the valve
member 32 presses against the valve seat part 46a.

[0102] In the second embodiment, the air intake opening 26 includes a
tapered portion above the barrel-shaped body 50. A barrel member 25
extends from the tapered portion at the floor 1e toward an upper end of
the cartridge 1. The barrel member 25 includes an opening 91 at an upper
end. When the cartridge 1 is filled with ink and situated in an upright
alignment, the opening 91 is positioned above the ink surface level in
the ink chamber 16. In various exemplary embodiments, an upper face 95 of
the barrel member 25, including the opening 91, is inclined or slanted
with respect to horizontal. In some such embodiments, the upper face 95
has a stepped configuration, such that the upper face 95 includes
multiple surfaces, the surfaces defining at least two different planes.
As a result of the slant or inclination of the upper face 95 of the
barrel member 25, a cross sectional area of the opening 91 of the barrel
member 25 taken at the slanted or inclined upper face 95 is greater than
a horizontal cross sectional area of an interior portion 93 of the barrel
member 25. In addition, a horizontal diameter of the interior portion 93
of the barrel member 25 is preferably at least about 0.8 mm.

[0103] The slanted, inclined or stepped configuration of the opening 91 of
the barrel member 25, as well as the diameter of the interior portion 93
of the barrel member 25, prevent an ink meniscus from forming in the
event that ink from the ink chamber 16 contacts the opening 91, if, for
example, the cartridge 1 is positioned other than in an upright
alignment. It is advantageous to prevent formation of such an ink
meniscus in the opening 91, because, if an ink meniscus is formed, the
process of supplying ink during operation of the image recording
apparatus 2 will cause the meniscus to repeatedly break and reform. This
breaking and reforming of the meniscus results in a repeating variation
of an internal pressure of the cartridge 1. Such variation can adversely
affect print quality.

[0104] In various exemplary embodiments, the barrel member 25 is formed
integrally with the remainder of the ink chamber 16. Such an integral
structure obviates the necessity for multiple manufacturing steps to form
and join the ink chamber 16 and the barrel member 25. Accordingly, the
time and cost necessary to manufacture cartridges, such as disclosed
herein, are reduced.

[0105] The ink supply port 21 at the ink supply side has the anti-counter
flow valve 60. The anti-counter flow valve 60 consists of an umbrella
shaped flexible membrane part 60b that faces the lower surface of the ink
supply port 21 and a spindle part 60c that supports one end of the
membrane part 60b. Both the membrane part 60b and the spindle part 60c
are formed into one shape using synthesized resin material. The spindle
part 60c is inserted through the ink supply port 21 so that the flow
valve 60 can slide up and down. Normally, the membrane part 60b is
positioned at a distance from the ink supply port 21, and an extended
part 60a touches the top surface of the floor wall 1e. Ink is thus
allowed to smoothly flow from the ink chamber 16 toward the valve device
18. When ink starts to flow from the ink extraction tube 12 toward the
ink chamber 16, the membrane 60b will rise and block the ink supply port
21 and thus stop the flow of ink.

[0106] As described earlier, the ink chamber 16 is packaged at reduced
pressure. As such, when the ink cartridge 1 is attached to the inkjet
recording device 2, if the valve device 18 is opened before the valve
device 19, it is possible that ink already present in the ink extract
tube 12 will flow from the ink extract tube 12 toward the ink chamber 16.
Such flow of ink toward the ink chamber 16 will also draw ink present in
the recording head 7, to which the ink extract tube 12 is connected,
toward the ink chamber 16. Drawing ink present in the recording head 7
toward the ink chamber 16 can disrupt ink meniscuses present in nozzle
holes of the recording head 7. Disruption of the meniscuses can adversely
affect print quality. If the valve device 18 is opened before the valve
device 19 when air is present in the ink extract tube 12, such air may
flow from the ink extract tube 12 toward, and possibly into, the ink
chamber 16. Such flow of air into the ink chamber 16 will adversely
affect the deaerated state of the ink present therein possibly reducing
print quality. To prevent such backflow of air or ink, the anti-counter
flow valve 60 is used.

[0107] At the time of attachment, when the ink cartridge 1 is mounted on
the mounting part 3, the ink extracting tube 12 is inserted into the
introducing path 40 and pushes the valve member 32 upward. The valve
member 32 in turn pushes the projection part 37 of the urging part 46b
upward, and subsequently the side wall part 36 extends and the valve
member 32 detaches from the valve seat part 46a. As a result, the ink in
the ink chamber 16 is supplied to the ink extracting tube 12 through the
communication paths 38 of the valve member 32 and the communicating
passages 81a-81d of the ink extract tube 12. At the same time, the air
intake tube 13 is connected with barrel-shaped body 50, letting the
outside air flow into the ink chamber.

[0108] Unlike the first embodiment, film members 31, 51 are not used and
accordingly a pointed part 72 is not used to rupture the film members 31,
51. As such, when the valve member 32 is pushed up, ink exists in the
barrel shaped bodies 30, 50. However, since the circular projecting
component 39 is urged against the valve seat part 46a by the projection
part 37, the ink chamber 16 and the top of the barrel shaped bodies 30,
50 are reliably sealed in order to prevent ink from leaking.

[0109] FIGS. 9A and 9B show a variation of the valve member 32 shown in
FIG. 8. As noted above, when the ink cartridge 1 is installed on the
mounting part 3, the ink extracting tube 12 and air intake tube 13 push
the valve member 32 upward, and the valve member 32 in turn pushes the
projection part 37 of the urging part 46b installed in the support member
46.

[0110] On the other hand, because there are disparities in the length of
the ink extracting tube 12 and the air intake tube 13, and there are also
disparities in distance from the bottom of the ink cartridge 1 to the
valve member 32 depending on many other parts. The overall disparity can
thus become relatively large. When the disparity is large, and when the
ink cartridge 1 is installed to the mounting part 3, the valve member 32
may be pushed up close to the opening 37a of the projection part 37 and
may be caught by the opening 37a. When the ink cartridge 1 is detached
from the mounting part 3 at this state, the valve member 32 is not in
contact with the valve seat part 46a, thus causing the ink to leak.

[0111] In order to prevent this, in this variation, several pointed
projections 71a are attached to the valve side wall 71 of the valve
member 32 as shown in the FIG. 9, so that the friction between the top of
the valve side wall 71 and the projection part 37 is increased and they
remain attached even if the urging part 46b is extended.

[0112] FIG. 10 shows a ring-shaped projection 37b on the projection part
37 of the support member 46, which is added to achieve the same effect as
noted above. This ring-shaped projection 37b is attached to circular
valve side wall 71 of the valve member 32.

[0113] Based on these structures, and by adding the matching concave or
convex parts on the valve member 32 and the projection part 37, both
parts are prevented from making corresponding circular movements, thus
preventing the valve member 32 from not returning to the closed position.

[0114] FIGS. 11A and 11B are cross-sections of the ink cartridge 1 and the
mounting part 3 of the third embodiment. In this embodiment, the valve
device 19 and the mounting part 3 of the ink jet recording device 2
differ from the second embodiment shown in FIG. 7. Since the valve device
18 is the same, the explanation of the valve device 18 is omitted.

[0115] The valve device 19 is equipped with the support member 46 and the
valve member 32. The support member 46 is assembled using a rubber-like
elastic material just as the support member 46 in the first and second
embodiments, and is equipped with the valve seat part 46a and an urging
part 46b on the top part. The structures of these parts are identical
with the valve seat part 46a and the urging part 46b of the first and
second embodiments.

[0116] In the middle of the valve seat part 46a, the opening 41 is formed
to expose the center of the valve member 32 to the outside and, in the
lower portion, a sealing part 63 which surrounds the opening 41 is
projected toward the opposite side of the urging part 46b.

[0117] FIG. 12 shows the detail of the valve member 32. Just as the valve
member shown in the FIG. 8, the valve member 32 is equipped with a valve
68 consisting of the bottom part 70 and the valve side wall part 71. The
explanation of the detailed construction including communication paths 38
and projecting part 59 is omitted since they are explained in reference
to FIGS. 8A-8E.

[0118] In this example, the bottom part 70 is attached with a cylindrical
part 66 which stands vertically from the top surface. When the ink
cartridge 1 is installed on the mounting part 3 in a normal manner and
the valve member 32 is pushed upward from the valve seat part 46a, the
top edge of the cylindrical part 66 is positioned apart from the inside
surface of the barrel member 25 and thus the through-pass between the ink
chamber 16 and the opening 41 of the valve seat part 46a is secured.

[0119] The bottom part 70 is attached with the operating member 67 which
extends vertically from the opening 41 on the side being exposed. Several
concave portions 67a and convex portions 67b are formed on the outer
circumference of the operating member 67, which extend along the
direction of the axis. This configuration, in which the operating member
67 is attached to, or formed integrally with, the valve member 32,
provides distinct advantages over arrangements in which the operating
member 67 is separate from the valve member 32. For example, in order for
an operating member 32 to operate a valve, the operating member must be
positioned in cooperation with the valve member 32. In configurations in
which the operating member 67 is separate form the valve member 32, the
position of the operating member 67 with respect to the valve member 32
must be carefully controlled because misalignment of the operating member
67 with respect to the valve member 32 could result in leakage and/or
damage to the valve member 32. Such control is not necessary in
configurations in which the operating member 67 is attached to, or formed
integrally with, the valve member 32.

[0120] Moreover, in an apparatus including two or more valves (e.g., an
ink cartridge with an air valve and an ink valve) that is used with a
device (e.g., an image forming device) that communicates with the valves,
it may be advantageous to provide valves of different types--that is, one
or more valves can be provided having a configuration in which an
operating member is attached to a valve member and one or more valves can
be provided having a configuration in which an operating member is not
attached to a valve member. In the instance in which a valve is provided
having a configuration in which an operating member is not attached to a
valve member, the operating member could be attached to the device at a
specified location. As at least one of the valves includes an attached
operating member, that valve would not be able to communicate with the
device at the specified location because two operating members would be
present. Such an arrangement will ensure that when the apparatus is
installed in the device, each valve properly communicates with a
respective region of the device.

[0121] FIG. 11A shows the state prior to the installation of the ink
cartridge 1 onto the mounting part 3 of the ink jet recording device 2,
and the lower edge of the operating member 67 is made so that it is
positioned slightly above the lower edge of the sealing part 63. In this
state, both the valve member 32 of valve device 18 and the valve member
32 of the valve device 19 are pressed against the valve seat part 46a of
the support member 46 and thus each valve device is not released.

[0122] With respect to the mounting part 3 of the ink jet recording device
2, the ink extracting tube 12 is projected in the ink supplier part just
as the first and second embodiments, and a porous body 3c such as sponge
is attached around the ink extracting tube 12 so that the leakage of ink
will be absorbed. In the outside air intake part, the convex part 3d is
formed in such a way that it corresponds to the sealing part 63, and the
air intake tube 13 is attached to the bottom surface of the concave part
3d.

[0123] As shown in FIG. 11B, when the ink cartridge 1 is installed, the
tip of the ink extracting tube 12 pushes the valve member 32 of the valve
device 18 just as in the first and second embodiments, thus releasing the
valve device 18.

[0124] In the outside air intake part, the tip of the operating member 67
touches the bottom of the concave part 3d, and the valve seat part 46a is
moved downward while the valve member 32 is fixed, releasing the valve
device. At the same time, the bottom edge of the sealing part 63 is
attached to the bottom of the concave part 3d, and a passage is formed
between the air intake tube 13 and the ink chamber 16 through the
released valve device 19.

[0125] In the third embodiment, the valve member 32 equipped with the
operating member 67 is installed only in the valve device 19. However,
the valve member 32 equipped with the operating member 67 may also be
installed in the ink supply part so that the ink extracting tube 12 does
not project to the mounting part 3.

[0126] FIG. 13 is a sectional view of the ink cartridge 1 of a fourth
embodiment. In this embodiment, a cover 1f covers a bottom area of the
container wall 1a of the ink cartridge of FIG. 2. The ink cartridge 1
also includes two walls 1g and 1h similar to the ink cartridge 1 of FIG.
7 that form the barrel-shaped bodies 30 and 50 which are open downward.
The valve device 18 is placed in the barrel-shaped body 30 and the valve
device 19 is placed in the barrel-shaped body 50. The valve device 18 and
the valve device 19 are identical to the valve devices of FIG. 2. Located
opposite the positioning parts 33a of the valve devices 18 and 19, the
cover 1f includes a cover 63 that covers the valve device 18 and a cover
64 that covers the valve device 19.

[0127] The ink cartridge 1 also includes an opening 86 that is formed in
the partition wall 1c that allows ink I to be supplied to the ink chamber
16 during manufacturing. After the ink has been supplied to the ink
chamber 16 and before the cover 1f is placed on the container wall 1a, a
stopper 88 is placed against the partition wall 1c in order to cover the
opening 86.

[0128] An ink detection level device 90 is located within the ink chamber
16. The ink detection level device 90 includes a support 100 that extends
from the partition wall 1c, a blocking member 92 attached to an arm 98, a
balance member 96 attached to an opposite end of the arm 98 and a pivot
94 attached to the support 100.

[0129] After the ink chamber 16 is filled with ink I, and when the ink
cartridge 1 is held in an upright position, the blocking member 92
remains in the projection 110. While the blocking member 92 remains in
the projection 110, a sensor (not shown) is able to detect the presence
of the blocking member 92 so that a user is informed that the ink chamber
16 is full.

[0130] When the ink chamber 16 is emptied, the arm 98 rotates via the
pivot 94 such that the balance member 96 eventually rotates toward and
contacts the partition wall 1c. As such, the blocking member 92
eventually rotates to a position outside the indicated box area. The
sensor is thus able to detect the absence of the blocking member 92 and
inform the user that the ink chamber 16 is empty.

[0131] FIGS. 14A and 14B are views of an ink cartridge 1 according to a
fifth embodiment of the invention. FIG. 14A is a perspective view of the
ink cartridge 1 from an upper direction, FIG. 14B is a perspective view
of the ink cartridge 1 from a lower direction and FIG. 15 is a sectional
view taken along a line III-III of FIG. 14B.

[0132] The ink stored in the ink cartridge 1 is deaerated ink on which
deaeration processing has been performed, and the ink has been sealed in
the ink cartridge. The ink is deaerated in order to suppress an emitting
failure due to the existence of bubbles in ink within the ink chamber 16.

[0133] The ink cartridge 1 includes the container wall 1a in which the
upper/lower end surfaces are open, and the lid 1b which is fixed in order
to cover the opening on the top surface of the container wall 1a. The lid
1b is provided with a gripping part 1d which is outwardly protruded in
order to improve operability when the ink cartridge 1 is detached
from/attached to the inkjet recording apparatus 2. Furthermore, the
container wall 1a and the lid 1b are formed of a resin material.

[0134] As shown in FIG. 15, the partition wall 1c divides the inside of
the ink cartridge 1 into two spaces and is formed integrally with the
container wall 1a. Within these two spaces, the space between the
partition wall 1c and the top opening covered by the lid 1b (i.e., the
top portion) is formed as the ink chamber 16 which stores ink, and the
space between the partition wall 1c and the lower opening (i.e., the
bottom portion) is formed as a second chamber 17. The partition wall 1c
extends perpendicular to the center axis direction of the container wall
1a at a substantially intermediate position between the top opening and
the bottom opening. Because of this, the ink cartridge 1 is supported
from the inside by the partition wall 1c at the substantially
intermediate position of the ink cartridge 1. Thus, pressure resistance
against a pressure to be added toward the inside from the outside of the
ink cartridge 1 improves, and deformation and damage of the ink cartridge
1 can be suppressed.

[0135] Additionally, the container wall 1a forms a substantially
rectangular shape in horizontal cross-section, but the four corners are
formed with substantially cylindrical curved walls 1k, and the side
surfaces between the curved walls 1k are formed as concave parts 1l
facing outward. By so doing, the rigidity of the ink cartridge 1 with
respect to the above-mentioned pressure is improved.

[0136] On the partition wall 1c, the barrel-shaped body 30, which extends
toward the opening of the second chamber 17, is connected and formed so
as to protrude into the second chamber 17 from the partition wall 1c and
surround the cylindrical wall 22. In addition, on the partition wall 1c,
the second barrel-shaped body 50, which extends toward the opening of the
second chamber 17, is connected and formed so as to protrude toward the
second chamber 17 from the partition wall 1c and surround the cylindrical
wall 24.

[0137] The outside surface of the barrel-shaped body 30 and the outside
surface of the second barrel-shaped body 50 are connected to a pair of
side surfaces of the container wall 1a, respectively. The barrel-shaped
body 30 and the second barrel-shaped body 50 are mutually connected to a
connecting member 1m. Additionally, the connecting member l1 is connected
to a pair of side surfaces different from the above-mentioned pair of
side surfaces by a connecting member 1n. Because of this, the second
chamber 17 is divided into four spaces 10a, 10b, 10c, 10d (see FIG. 14B)
by the interconnected barrel-shaped body 30, second barrel-shaped body
50, and connecting members 1m, 1n. That is, the barrel-shaped body 30,
the second body-shaped body 50, and the connecting members 1m, 1n
function as a support member which support the container wall 1a from the
inside, so that pressure resistance of the container wall 1a improves
with respect to a pressure that is added to the inside from the outside
of the ink cartridge 1. Damage and deformation of the ink cartridge 1 can
thus be suppressed.

[0138] Next, a procedure for packaging the ink cartridge 1 into a
packaging member 82 is explained with reference to FIGS. 16 and 17. FIGS.
16 and 17 are sectional views showing a state after a packaging body of
the ink cartridge 1 is manufactured.

[0139] The packaging member 82 includes the ink cartridge 1 inside which
deaerated ink is stored. The packaging member 82 is composed of a
cylindrical seal material, and is provided with a shielding layer which
suppresses humidity and air penetration. The shielding layer has a
laminated structure in which a plurality of film sheets are laminated. In
a state in which the ink cartridge 1 is contained, both end parts
(hereafter referred to as "fused parts") 83a, 83b of the packaging member
82 are fused together, forming a bag shape. In order to maintain a
sufficient degree of deaeration of the ink cartridge 1, the pressure is
reduced between the ink cartridge and the packaging member 82.

[0140] The sheet material which constitutes the packaging member 82
includes, for example, laminating, in order, an adhesive layer and a
nylon layer (external surface layer) on one side of an aluminum alloy
layer, and an adhesive layer, a polyethylene terepthalate layer, an
adhesive layer, and a polypropylene layer (internal surface layer) on the
other side of the aluminum alloy layer.

[0141] In terms of manufacturing the packaging body of the ink cartridge 1
in which the ink cartridge 1 is contained, within a space in which
pressure is reduced by a vacuum pump or the like so as to be a vacuum or
an atmosphere close to a vacuum state, the ink cartridge 1 in which
deaerated ink is stored is inserted into the packaging member 82. One of
the fused parts 83a of the packaging member 82 is thermally fused in
advance, and the other fused part 83b is open. Then, the other fused part
83b of the packaging member 82 is thermally fused. When the fused part
83b is formed and sealed, and the packaging is completed (the states of
FIGS. 16 and 17). The ink cartridge 1 is thus sealed in the packaging
member 82.

[0142] Thus, pressure is constantly applied inward from the outside of the
ink cartridge 1. However, in the ink cartridge 1, the partition wall 1c
is arranged at the substantially intermediate position between the two
openings of the container wall 1a, so that the ink cartridge 1 can
tolerate the pressure applied to the ink cartridge 1. Damage and
deformation of the ink cartridge 1 can thus be prevented. Rigidity of the
ink chamber 16 is improved by the partition wall 1c, the lid 1b fixed to
the upper end opening, and the curved walls 1k. Furthermore, with respect
to the second chamber 17, the barrel-shaped body 30 and the second
barrel-shaped body 50 are connected to a pair of side surfaces of the
respective container wall 1a and are also connected to another pair of
side surfaces by the connecting members 1m, 1n. Thus, the pressure
resistance of the second chamber 17 of the ink cartridge 1 can be
improved. Deformation and damage of the ink cartridge 1 can thus be
reliably suppressed.

[0143] Therefore, damage and deformation of the ink cartridge 1 which
causes ink leakage from the ink chamber 16, and which creates a shape of
the ink cartridge 1 which cannot be mounted to the inkjet recording
apparatus 2 due to damage and deformation can be reliably suppressed.

[0144] Also, while in the above example the outer shape of the valve
devices 18 and 19 are made slightly smaller than the inside shape of the
barrel-shaped bodies 30 and 50 and are fixed through the pressure from
the holding wall 42, the outer shape of the valve devices 18 and 19 can
be made slightly larger than the inside shape of the barrel-shaped bodies
30 and 50 and the valve devices 18 and 19 may be fixed by driving them
into the through-chamber.

[0145] FIGS. 18-19B are views of an ink cartridge 1 according to a sixth
embodiment of the invention. FIG. 18 is a sectional diagram of the ink
cartridge 1, FIG. 19A is an enlarged diagram showing an inner wall
surface, and FIG. 19B is an enlarged cross-sectional diagram showing part
D in FIG. 18; and

[0146] As shown in FIG. 18, the ink cartridge 1 includes the substantially
cylindrical container wall 1a in which the upper/lower end surfaces are
open, and a lid 1b which is fixed in order to cover and seal the opening
on the top surface of the container wall 1a. The lid 1b is provided with
the gripping part 1d which protrudes outwardly in order to improve
operability when the ink cartridge 1 is detached from/attached to the
inkjet recording apparatus 2. The inside of the gripping part 1d is
formed in a hollow shape, and on the inner wall surface of the lid 1b,
mesh shaped dispersing grooves 14 are formed to hold the ink I by
capillary action in a state where the ink is dispersed in a first
direction and a second direction perpendicular to the first direction
(see FIGS. 19A and 19B). These dispersing grooves 14 will be described
later. As shown in FIG. 18, the container wall 1a and the lid 1b are
formed of a resin material. The ink I to be supplied to the recording
head 7 is stored in the ink chamber 16 formed inside the ink cartridge 1.
The container wall 1a and the lid 1b are formed from a transparent or
semi-transparent resin material, and structured to allow the color of the
ink I stored in the ink chamber 16 to be recognized.

[0147] As shown in FIG. 18, the partition wall 1c divides the inside of
the ink cartridge 1 into two spaces and is formed integrally with the
container wall 1a. Within these two spaces, the space between the
partition wall 1c and the top opening covered by the lid 1b (i.e., the
top portion) is formed as the ink chamber 16 which stores ink, and the
space between the partition wall 1c and the lower opening (i.e., the
bottom portion) is formed as a second chamber 17.

[0148] The ink I in the ink chamber 16, that is partitioned by the
partition wall 1c, is supplied up to a position near the top surface of
the container wall 1a. As a result, a space 20 that does not contain the
ink I is formed on the top side of the ink chamber 16 when the ink
cartridge 1 is installed in the inkjet recording apparatus 2. In this
space 20, the hollow part formed by a hollow shape inside the gripping
part 1d is also included.

[0149] Next, the dispersing grooves 14 formed on the inner surface of the
gripping part 1d are described with reference to FIGS. 19A and 19B. FIGS.
19A and 19B are diagrams showing the structure of the dispersing grooves
14. FIG. 19A is an enlarged diagram showing the inner wall surface of the
gripping part 1d and FIG. 19B is an enlarged cross-sectional diagram
showing part D in FIG. 18.

[0150] On the some or all of the inner wall surface of the lid 1b,
square-shaped protruding parts are positioned at an equal distance in the
first direction and the second direction from each other as shown in FIG.
19A, and grooves are formed between the square-shaped projecting parts.
These grooves are laid in the in the first direction and the second
direction in a square mesh shape to form the dispersing grooves 14. The
ink I that adheres on the inner wall surface of the lid 1b enters into
these dispersing grooves 14 and is held within these grooves in a state
such that the ink I is dispersed in the vertical and horizontal
directions by capillary action. This stage is shown in FIG. 19B.

[0151] As shown in FIG. 19B, ink I in the dispersing grooves 14 is held by
capillary action. Ink I is held by capillary action even if the space 20,
which does not contain the ink, is formed inside the gripping part 1d as
a result of the user holding the gripping part 1d to install the ink
cartridge 1 into the inkjet recording apparatus 2 and the container wall
1a is on the lower side and the lid 1b is on the upper side. In this
case, the ink I does not flow out from the dispersing grooves 14.

[0152] The dispersing grooves 14 are formed in a square mesh shape by fine
grooves, and ink I is held in these dispersing grooves 14. Therefore,
when the user views the ink cartridge 1 from outside, the ink I can be
recognized as the ink I forms a thin film that adheres to the inside the
lid 1b.

[0153] The container wall 1a is formed by the same transparent or
semi-transparent material as the lid 1b. However, if the ink I is
gathered at a predetermined volume in the ink chamber 16, the color of
the ink I darkens and has a blackened color. For instance, when the ink I
of cyan or magenta is stored, the color of the ink I becomes almost
black. When the ink I in yellow is stored, the ink I becomes almost a
red-black. Therefore, it becomes difficult for the user to accurately
determine the color of the ink I.

[0154] However, because the ink cartridge 1 is formed with the space 20,
which does not contain the ink I, and the dispersing grooves 14 on the
inner wall surface of the lid 1b form a part of the space 20, and because
the ink I is held in the dispersing grooves 14 in a substantially thin
film state, the color of the ink I stored in the ink chamber 16 can be
accurately recognized.

[0155] As explained above, according to the ink cartridge 1 described
above, the lid 1b is formed to have some transparency, and the ink I
flows into the dispersing grooves 14 formed on the inner wall surface of
the gripping part 1d in a state that the ink I is dispersed in the
vertical and horizontal directions. The dispersing grooves 14 are formed
in a square mesh shape with fine grooves, and the space 20 that does not
contain the ink I is formed inside the gripping part 1d. Therefore, the
user can accurately recognize the color of the ink I in the ink cartridge
1 without any errors. Therefore, the ink cartridge 1, in which different
colors of ink I are respectively stored, can be prevented from being
installed in an incorrect position when installed in the inkjet recording
apparatus 2.

[0156] Moreover, because the ink cartridge 1 is formed from a transparent
or semi-transparent resin material, it is not necessary, as done
conventionally, to manufacture a different cover member for each color of
ink I. Therefore, parts for manufacturing the ink cartridge 1 can be
shared. As a result, complicated manufacturing processes for
manufacturing the ink cartridge by selecting a lid 1b corresponding to
the color of ink I can be omitted, and thus, the manufacturing process
for manufacturing the ink cartridge 1 can be simplified, resulting in a
reduction in the manufacturing cost of the ink cartridge 1.

[0157] Modified examples of the dispersing grooves 14 are described with
reference to FIGS. 20A-20D. FIGS. 20A-20D are diagrams showing various
formations of dispersing grooves 14.

[0158] The dispersing grooves 14 shown in FIGS. 19A and 19B are formed in
the square mesh shape. However, the dispersing grooves 14 could spread in
the vertical and horizontal directions in a deformed rectangular mesh
shape as shown in FIG. 20A, or in a parallelogram mesh shape as shown in
FIG. 20B. In addition, the dispersing groove could spread in the vertical
and horizontal directions in a triangular mesh shape as shown in FIG.
20C, or in a substantially circular mesh shape as shown in FIG. 20D in
which the dispersing grooves 14 can be formed between many fine
protruding parts having a substantially circular shape. The ink I adhered
on the inner wall surface can be held also in the dispersing grooves 14
shown in FIG. 20A-20D in a state that the ink I is dispersed in each
groove. That is, as long as the dispersing grooves 14 have grooves that
can hold the adhered ink I, the shape thereof is not particularly
limited.

[0159] As should be appreciated, various modifications are available. For
example, in the above-described embodiments, the dispersing grooves 14
are formed on the inner wall surface of the lid 1b. However, the
dispersing grooves 14 can be formed only on a part of the gripping part
1d. In addition, the dispersing grooves 14 can be formed on only the
upper part of the container wall 1a or on the entire inner wall surface
of the container wall 1a. Furthermore, the dispersing grooves 14 can be
formed on the inner wall surface of the sidewall of the ink cartridge 1
in an area visible by the user.

[0160] Furthermore, in the above-described embodiments, the ink cartridge
1 having a structure in that the lid 1b becomes the upper part in a state
that the ink cartridge 1 is installed in the inkjet recording apparatus 2
is employed. However, an ink cartridge having the lid on the sidewall or
an ink cartridge formed in a substantially box shape that does not have
the lid in a state that the ink cartridge is installed in the inkjet
recording apparatus, may be used. Therefore, the structure of the ink
cartridge is not limited. In this case, the dispersing grooves 14 are
formed on the inner wall surface of the sidewall of the ink cartridge
that becomes at least the upper part in a state that the ink cartridge 1
is installed in the inkjet recording apparatus 2.

[0161] Furthermore, in the above-described embodiments, the container wall
1a and the lid 1b are both formed from a transparent or semi-transparent
resin material. However, only the lid 1b may be formed by the transparent
or semi-transparent resin material, or only the gripping part 1d may be
formed by the transparent or semi-transparent resin material. In
addition, materials through which the ink color can be transparently
visible, such as materials having a milk-white color, are included in the
"transparent or semi-transparent" materials described in this invention.

[0162] According to an exemplary aspect of the invention, when an ink
cartridge is attached to an inkjet recording device, the valve member
resists the urging force of the urging member (i.e., projecting
component). Communication is thereby established between an ink chamber
and a flow path provided in the inkjet recording device. In a state in
which the ink cartridge is removed from the inkjet recording device, the
valve member is brought into direct contact with the valve seat by the
urging device, and leakage of ink through the opening is prevented.

[0163] Additionally, the urging device and valve seat are constructed from
a rubber, elastic material in an integrated form in order to serve as a
supporting member. Consequently, when the ink cartridge is discarded, for
example, in the case of disposal by incineration, incineration is
possible without modification, and there is no need for an operation to
disassemble the ink cartridge and remove the metal compression spring, as
in instances when a metal compression spring is used, and the resulting
effect is that the operational efficiency is increased, and disposal
costs are reduced.

[0164] Additionally, the valve member is held between the supporting
member and the device. As a result, communication and obstruction can be
carried out between the ink chamber and the flow path on the inkjet
recording device side by disposing the supporting member in the
communicating chamber in a state holding the valve member. Consequently,
there is no need for a troublesome operational process of attaching an
urging device that urges the valve member in the region where the valve
member is provided, and the resulting effect is that ink cartridge
manufacturing costs can be reduced.

[0165] According to an exemplary aspect of the invention, a valve member
is brought into direct contact with the valve seat by the urging device,
the ink flow path is obstructed reliably.

[0166] According to an exemplary aspect of the invention, an opening of a
valve member communicating path is formed non-circularly, with the
resulting effect that formation of a meniscus by surface tension of the
ink and obstruction of said opening is prevented, and a smooth flow of
ink is assured. If the opening of the communicating path were formed in
approximately circular form, a meniscus would form readily, with a risk
that ink flow would be obstructed.

[0167] According to an exemplary aspect of the invention, when a valve
member is moved towards the ink chamber side, the rising portion of the
urging device is readily extended and contracted, facilitating
opening/closing operation of the valve member.

[0168] According to an exemplary aspect of the invention, a thickness of a
portion of a urging device at the outer periphery of the valve member is
formed thinner than the thickness in the direction of penetration of the
valve seat hollow member, with the resulting effect that when the valve
member moves, deformation of the valve seat is small, and the urging
device undergoes great elastic deformation on the ink chamber side, and
consequently, communication is brought about reliably between the ink
chamber and the flow path on the inkjet recording device side.

[0169] According to an exemplary aspect of the invention, an inner
periphery of an edge forming the penetration side of the hollow member of
the sealing means is structured such that the diameter is smaller
increasingly from the penetration side towards the valve member side,
with the resulting effect that a hollow member with an outer diameter
formed larger than the inner diameter of the sealing means is made to
penetrate smoothly, and crimping is brought about reliably.

[0170] According to an exemplary aspect of the invention, inclination of a
sealing member in conjunction with elastic deformation of the inner
peripheral surface of the sealing means is prevented, and obstruction of
the flow path communicating between the ink chamber and the hollow member
is also prevented.

[0171] According to an exemplary aspect of the invention, in a state in
which the valve member is made to contact the valve seat directly by
means of the urging device, communication between the ink chamber side
and the sealing means side is reliably obstructed by the projecting
member. Ink leakage is thus prevented more reliably.

[0172] According to an exemplary aspect of the invention, when the valve
member separates from the valve seat, disconnection of the valve member
from the projecting portion of the impeller is prevented by the concavity
and convexity.

[0173] According to an exemplary aspect of the invention, the insertion
position of the supporting member is determined more reliably by the
attachment part and the stepped surface, and operational efficiency
during ink cartridge manufacturing is improved.

[0174] According to an exemplary aspect of the invention, the formation of
a meniscus by the surface tension of the liquid is prevented, and a
smooth flow of the liquid is assured.

[0175] As mentioned above, in Japanese Unexamined Patent Application
Publication H3-197052, for example, the protection device requires a
protection plate, a lock component, and twisted coil spring. As such, it
is necessary to secure space in the inkjet recording apparatus in order
to install each component. The inkjet recording apparatus is thus bigger
and manufacturing costs increase due to the increased number of
components.

[0176] Embodiments of this invention thus provide an ink cartridge that
can supply the ink safely without any specific safety device installed at
the inkjet recording apparatus.

[0177] An ink cartridge according to an exemplary aspect of the invention
includes an ink chamber that can store ink; a communication chamber with
an opening that can receive an extract component; a film component that
blocks communication between the communication chamber and the ink
chamber; and a breaking component, which is positioned at the
communication chamber, that can rupture the film component when the
extract component is moved into the communication chamber.

[0178] An ink cartridge according to an exemplary aspect of the invention
includes an ink chamber that can store ink; a communication chamber with
a first opening that communicates with the ink chamber and a second
opening that can receive an extract component; a valve that is positioned
between the first opening and the second opening; and a support that
supports a bottom surface of the valve, wherein an ink passage is formed
between the valve and the support when an extract component is inserted
into the communication chamber.

[0179] According to an exemplary aspect of the invention, it is not
necessary to make the tip of an extract component acuminate. Therefore,
the user will not be hurt by the extract component projecting from the
inkjet recording apparatus, and thus the safety is improved. At the same
time, it is not necessary to install a protection device to protect the
extract component on the side of the inkjet recording apparatus, which
has an effect of reducing production costs.

[0180] According to an exemplary aspect of the invention, work processes
that are used to adhere a film component after an ink cartridge is
manufactured is shortened. In this regard, there is an effect to improve
the efficiency of a manufacturing operation. According to an exemplary
aspect of the invention, it is also possible to avoid using a film
component.

[0181] According to an exemplary aspect of the invention, a breaking
component is formed in an acuminate form toward a film component, and
therefore, there is an effect that it can reliably rupture the film
component when it is pushed by an extract component toward the side of
the film component.

[0182] According to an exemplary aspect of the invention, grooves are
formed to form a passage for ink to flow between a breaking component and
a film component. There is thus an effect in that an ink passage that
connects the ink chamber and the communicating chamber is reliably formed
by the grooves.

[0183] According to an exemplary aspect of the invention, multiple grooves
are formed, and such multiple grooves are formed at approximately even
intervals on an external wall of a breaking component. It is thus
possible to form more ink passages connecting the ink chamber with the
communicating chamber. Therefore, there is an effect that the ink can be
supplied constantly to the extract component.

[0184] According to an exemplary aspect of the invention, it is possible
to widen ink passages connecting an ink chamber and a connecting chamber
further and supply ink constantly. In addition, there is an effect to
prevent the breaking component from being immovable from the film
component when an ink cartridge is attached and removed.

[0185] According to an exemplary aspect of the invention, a valve
component is positioned in a communicating chamber closer to the side of
the opening rather than the breaking component and therefore, it is
possible to either communicate or shut off the ink passages by the valve
component after the breaking component ruptures the film component and
the communication between the ink chamber and the communicating chamber
is opened. In this regard, there is an effect to prevent the ink from
leaking when an ink cartridge is attached or removed.

[0186] According to an exemplary aspect of the invention, since a valve
component and the breaking component are formed as a unit with each
other, there is an effect to decrease the number of components and thus
reduce the production cost.

[0187] According to an exemplary aspect of the invention, when an ink
cartridge is loaded into the inkjet recording apparatus, the first film
component is broken off after the second film component on the side of
the air intake component is broken off first so that air is supplied to
the ink chamber and the ink is supplied to the recording head smoothly.

[0188] According to an exemplary aspect of the invention, since a second
valve component, which selectively communicates and blocks off the ink
passages by the air intake component, is positioned on the opening side
rather than the second breaking component side in the air intake chamber,
communication and blocking off of the ink passages can be selected by the
second valve component once the second film component is broken off and
the communication between the ink chamber and the air communicating
chamber is opened. Thus, there is an effect to be able to prevent the ink
from leaking when an ink cartridge is attached and removed.

[0189] According to an exemplary aspect of the invention, since a second
valve component and the second breaking component are formed as a unit
with each other, there is an effect to decrease the number of components
and thus reduce the production cost.

[0190] According to an exemplary aspect of the invention, there is an
effect to be able to reliably prevent the ink from leaking from the
communicating chamber while an ink cartridge is attached or removed since
the valve component is biased in the direction of the valve seat unit
from the ink chamber side due to the biasing unit.

[0191] According to an exemplary aspect of the invention, there is an
effect to be able to reliably prevent the ink from leaking from the
communication chamber while an ink cartridge is attached or removed since
the second valve component is biased in the direction of the second valve
seat unit from the ink chamber side due to the biasing unit.

[0192] According to an exemplary aspect of the invention, a tube unit, a
biasing unit and a valve seat unit are manufactured by elastic materials
like rubber as a unit with each other. Therefore, when an ink cartridge
is discarded, for example when it is discarded by incineration, it can be
incinerated and it is not necessary to disassemble the ink cartridge to
take out a compression spring made of metals, and thus, there is an
effect to be able to improve the efficiency of operation and reduce the
disposal cost.

[0193] According to an exemplary aspect of the invention, it is possible
to open or block off communication between an ink chamber and the outside
by positioning a supporting component that is in the state of holding a
valve component in the communicating chamber. Thus, a complicated
operating process of installing a biasing means to bias the valve
component in the field where the valve component is positioned can be
eliminated, and therefore, there is an effect to be able to reduce the
manufacturing cost of the ink cartridges.

[0194] Furthermore, the above described ink cartridges, in Japanese
Laid-Open Patent Application No. 9-20018 for example, prevent
misinstallation in inkjet recording apparatus by employing cover members
formed from materials that are the same color as the ink stored therein.
However, because such cover members are formed in different colors
corresponding to various ink colors, the number of parts necessary to
manufacture ink cartridges increases, and manufacture must include
selecting cover members that correspond to colors of ink used in such
cartridges, thus complicating manufacturing processes. Accordingly,
manufacturing costs for ink cartridges increases.

[0195] In ink cartridges formed from transparent or semi-transparent
materials, the stored ink can be recognized when viewing such cartridges.
However, if ink is collected at a predetermined volume in such ink
cartridges, the color of the ink is dark. As a result, it can be
difficult to accurately recognize the color of the ink stored in such ink
cartridges.

[0196] Embodiments of the present invention include ink cartridges, in
which manufacturing costs are reduced by using fewer parts during
manufacture of such ink cartridges, and by which the color of the ink in
such cartridges can be accurately recognized. Embodiments of the present
invention further include inkjet recording apparatus in which ink
cartridges can be installed.

[0197] In exemplary embodiments, ink cartridges include an ink chamber
that can store ink. Ink chambers can include an upper part and a lower
part with the lower part storing ink and the upper part including a space
that does not contain ink. In exemplary embodiments, at least one part of
an upper part is formed of a transparent or semi-transparent material,
and grooves can be provided on an inner wall surface of the at least one
part, the grooves being designed to hold the ink on the inner wall
surface by capillary action such that the ink is dispersed in vertical
and horizontal directions.

[0198] In exemplary embodiments, ink cartridges include an ink chamber
that can store ink, wherein an upper end of the ink chamber is open and a
cover covers the upper end. In exemplary embodiments, a space that does
not contain the ink can be present between an inner wall surface of a
cover and stored ink, at least one part of the cover being formed from a
transparent or semi-transparent material. In exemplary embodiments,
grooves can be provided on the inner wall surface, the grooves being
designed to hold ink on the inner wall surface by capillary action such
that ink is dispersed in vertical and horizontal directions.

[0199] In exemplary embodiments, ink cartridges can include an ink chamber
that can store ink and a gripping part projecting outwardly from a cover.
In exemplary embodiments, a space that does not contain ink can be
present between an inner wall surface of the gripping part and the ink,
at least one part of the gripping part being formed from a transparent or
semi-transparent material. In exemplary embodiments, grooves can be
provided on the inner wall surface, the grooves being designed to hold
ink on the inner wall surface by capillary action such that the ink is
dispersed in vertical and horizontal directions.

[0200] According to an exemplary aspect of the invention, an ink chamber
is formed so as to store the ink in a lower part thereof and leave a
space that does not contain the ink in an upper part thereof, in a state
that the ink cartridge is installed in the inkjet recording apparatus. In
the ink chamber, at least one part of the upper part at which the space
is formed is formed by a transparent or semi-transparent material. In
addition, mesh-shaped dispersing grooves are provided on the inner wall
surface of the transparent or semi-transparent part, which is designed to
hold the ink on the inner wall surface by capillary action in a state
that the ink is dispersed in vertical and horizontal directions.

[0201] According to an exemplary aspect of the invention, when an ink
cartridge is transported or installed in the inkjet recording apparatus,
the ink moves inside the ink chamber and always adheres on the internal
surface on which the dispersing grooves are formed, and is held by the
capillary action in the state that ink is dispersed in the vertical and
horizontal directions. Therefore, through the transparent or
semi-transparent material on which the dispersing grooves are formed, the
color of the ink that spread along the dispersing grooves on the inner
surface can be accurately recognized. As such, the color of the ink can
be recognized, and incorrect installation of the ink cartridge in an
inkjet recording apparatus can be prevented.

[0202] According to an exemplary aspect of the invention, for an ink
cartridge, because the at least one part on which the dispersing grooves
are formed is structured by the transparent or semi-transparent material,
each color of ink can be respectively stored in commonly manufactured ink
cartridges. Therefore, because the parts for manufacturing the ink
cartridges can be shared, complicated manufacturing processes, such as
manufacturing ink cartridges by selecting covers based on the color of
the ink, can be omitted, resulting in an effect that the manufacturing
costs can be reduced.

[0203] According to an exemplary aspect of the invention, dispersing
grooves are formed on an inner wall surface of a lid that is structured
to cover the open end at an upper part of the ink cartridge and seal the
inside of the ink cartridge. Therefore, the user can recognize the ink by
viewing the lid from the top when installing the ink cartridge to the
inkjet recording apparatus, and thus, incorrect installation of the ink
cartridge is accurately prevented.

[0204] According to an exemplary aspect of the invention, a lid is
provided with a gripping part projecting outwardly from the lid for
installing the ink cartridge to the inkjet recording apparatus, and the
dispersing grooves are formed on an inner wall surface of the gripping
part. Because the user installs the ink cartridge by holding the gripping
part, the user can accurately recognize the ink in the ink cartridge by
viewing the gripping part when installing the ink cartridge. As a result,
incorrect installation of the ink cartridge is more accurately prevented.

[0205] According to an exemplary aspect of the invention, dispersing
grooves are formed in a rectangular mesh shape, a parallelogram mesh
shape, or a substantially oval mesh shape. The dispersion grooves are
formed by arranging projecting parts in a rectangular, parallelogram, or
substantially oval shape and by forming grooves in the vertical and
horizontal directions between the projecting parts. Therefore, because a
rectangular, parallelogram, or substantially oval shape is a simple
shape, there is an effect in that formation of the dispersion grooves can
be achieved easily.

[0206] According to an exemplary aspect of the invention, an ink
cartridge, by which the ink color in the ink cartridge can be accurately
recognized, is installed in the inkjet recording apparatus. Therefore,
incorrect installation of the ink cartridge is accurately prevented.

[0207] According to an exemplary aspect of the invention, a partition wall
is arranged at a substantially intermediate position of the side wall,
and a cover is fixed to one side wall. The ink cartridge can thus
tolerate the added pressure to the inside from the outside of the ink
cartridge. Because of this, in order to suppress the degree of deaeration
of the ink cartridge, even when the ink cartridge is contained in a
packaging body in a pressure-reduced state, the ink cartridge can
suppress damage and deformation. Therefore, it is possible to prevent the
ink within the ink chamber from leaking due to deformation and damage of
the ink cartridge. At the same time, a situation in which the ink
cartridge cannot be mounted to the inkjet recording apparatus due to
deformation and damage of the ink cartridge can be prevented.

[0208] As discussed above, in Japanese Laid-Open Patent Application
11-58775 for example, in order to suppress the deterioration of deaerated
ink, a cartridge is held in a pressure-reduced state within a packaging
body. Pressure is applied to the ink cartridge from the outside toward
the inside of the ink cartridge. In order to suppression deterioration of
deaerated ink, it is necessary to maintain the inside of the packaging
body in a vacuum or in a state which is close to a vacuum. A large
pressure is thus applied to the ink cartridge from the outside toward the
inside.

[0209] As described with the above-mentioned ink cartridge, two spaces are
formed. A plurality of flat parts are thus used to create the two spaces
within the ink cartridge, the ink chamber and the ink supply chamber are
aligned in the case with their respective top surfaces open, and the ink
chamber has a larger space. As such, the ink cartridge can easily become
deformed due to forces applied at the time of pressure reduction. In the
case of a relatively small carriage-mounted type ink cartridge, the area
of the flat part(s) is small and thus forces applied when the pressure is
reduced are tolerated. However, if the conventional ink cartridge is
large, the ink cartridge cannot tolerate the pressure. If the shape of
the ink cartridge is damaged or deformed, ink leaks from the inside of
the cartridge to the outside, and the ink cartridge cannot be normally
mounted in an image forming apparatus.

[0210] Embodiments of this invention provides for an ink cartridge having
a structure that can suppress shape deformation and damage of the ink
cartridge in a pressure-reduced state within a packaging body. This
invention further provides a packaging body of the ink cartridge that
includes an ink cartridge.

[0211] In exemplary embodiments, an ink cartridge includes a side wall; a
partition wall that divides an inside space surrounded by the side wall
at a substantially intermediate position between a first opening and a
second opening opposite the first opening, wherein an ink chamber that
can store ink is formed between the first opening and the partition wall
and a second chamber is formed between the second opening and the
partition wall; and a cover that covers the first opening and is fixed to
an end surface of the side wall.

[0212] In exemplary embodiments, an ink cartridge includes a side wall, of
which both opposite end surfaces are respectively open; a partition wall
that divides an inside space surrounded by the side wall at a
substantially intermediate position between a first opening and a second
opening opposite the first opening, wherein an ink chamber that can store
ink is formed between the first opening and the partition wall and a
second chamber is formed between the second opening and the partition
wall; a cover that covers the first opening and is fixed to an end
surface of the cylindrical side wall; an ink supply port which is formed
in the partition wall and enables communication between the ink chamber
and the second chamber; and a valve device which is arranged within the
second chamber opposite the ink supply port and selectively allows
communication between the ink chamber and an area outside the ink
chamber.

[0213] In exemplary embodiments, an ink cartridge includes a side wall, of
which both opposite end surfaces are respectively open; a partition wall
which divides an inside space surrounded by the side wall between a first
opening and a second opening opposite the first opening, wherein an ink
chamber that can store ink is formed between the first opening and the
partition wall and a second chamber is formed between the second opening
and the partition wall; an ink supply port which is formed in the
partition wall and enables communication between the ink chamber and the
second chamber, wherein a first cylindrical part extends into the second
opening and surrounds the ink supply port; an air intake opening which is
formed in the partition wall and enables communication between the ink
chamber and the second chamber, wherein a second cylindrical part extends
into the second opening and surrounds the air intake opening; and a wall
that extends between the first cylindrical part and the second
cylindrical part.

[0214] According to an exemplary aspect of the invention, a wall extends
in a direction crossing an opening within the second chamber. Thus, even
if the pressure is added from the outside to the second chamber side,
deformation and damage can be prevented.

[0215] According to an exemplary aspect of the invention, rigidity of the
side wall of the second chamber side and in the vicinity of the ink
supply port can be improved, and the accuracy of connecting the ink
cartridge with a device such as an ink jet head or the like can be
improved.

[0216] According to an exemplary aspect of the invention, a valve device
which is arranged opposite to the ink supply port within the cylindrical
part and selectively allows communication between the ink chamber and an
area outside the ink chamber.

[0217] According to an exemplary aspect of the invention, the cylindrical
side wall is shaped such that a plurality of substantially partial
cylindrical curved walls are arranged in a circumferential direction and
concave parts are formed between the curved walls. Therefore, rigidity of
the side walls can be improved, and the ink cartridge can tolerate
external pressure as described above.

[0218] According to an exemplary aspect of the invention, a side wall, the
partition wall, and the wall extending in a crossing direction within the
second chamber are integrally molded by a resin material. Thus, an ink
cartridge with a high rigidity can be easily molded.

[0219] According to an exemplary aspect of the invention, even when
rigidity of an ink cartridge is improved and pressure-reduced packaging
is performed, deformation and damage can be prevented. Furthermore, as
the valve device is mounted by using the second chamber, the entire
device can be made smaller.

[0220] According to an exemplary aspect of the invention, a valve device
for air intake can be mounted by using the second chamber, so that the
entire device can be made smaller.

[0221] According to an exemplary aspect of the invention, rigidity of the
side wall of the second chamber side and in the vicinity of the ink
supply port can be improved, and accuracy of connection with a device
such as an ink jet head or the like to be connected to the ink supply
port can be improved. Furthermore, the valve device can be easily mounted
with good accuracy by using a cylindrical portion.

[0222] According to an exemplary aspect of the invention, a connecting
member which interconnects the two cylindrical bodies is further
provided, so that rigidity of the side wall of the second chamber side
and in the vicinity of the ink supply port can be further improved.

[0223] According to an exemplary aspect of the invention, a degree of
deterioration can be suppressed, and even if the inside is contained in a
packaging member in a pressure-reduced state, deformation and damage of
the ink cartridge can be prevented.

[0224] While this invention has been described in conjunction with the
exemplary embodiments and examples outlined above, various alternatives,
modifications, variations, improvements and/or substantial equivalents,
whether known or that are or may be presently unforeseen, may become
apparent to those having at least ordinary skill in the art. Accordingly,
the exemplary embodiments of the invention, as set forth above, are
intended to be illustrative, not limiting. Various changes may be made
without departing from the spirit and scope of the invention. Therefore,
the invention is intended to embrace all known or later developed
alternatives, modifications, variations, improvements and/or substantial
equivalents.